Question

X-y=3
y+2z=1
x-2z=0

x, y, z?

Answer 1

X-y=3
x=3+y
x-2z=0
(3+y)-2z=0
y-2z=-3
y=-3+2z
y+2z=1
(-3+2z)+2z=1
4z=1+3
4z=4
z=1
y+2(1)=1
y+2=1
y=1-2
y=-1
x-y=3
x-(-1)=3
x+1=3
x=3-1
x=2